5 UPS Working Principle
5.1 UPS System Block Diagram
Figure 5.1 above illustrates the True On-Line Double Conversion architecture of the UPS
system. The major modules consist of:
1) An AC to DC power converter (Rectifier) with PFC control circuit
2) A DC to AC power high frequency inverter
3) An Intelligent Battery Charger
4) A bank of stationary maintenance-free batteries
5) A DC to DC push/pull converter control circuit
6) A Static Bypass Loop
7) Input & Output EMI Filter
The table below provide a summery guide to the UPS operating modes against the Utility AC
Power Source conditions
Utility
UPS Operating Modes
LEDs Display
Conditions
indications
Utility Normal
Rectifier convert AC to DC, battery
LEDs
charging, Inverter convert DC to AC
and supply to loads with clean & stable
power.
remain illuminated
Utility Abnormal
Rectifier and charger stop
LED off, LED
(under or over
operating Battery discharge via
illuminated
voltage) / Absent
DC~DC push/pull circuit and supply to
Inverter. Loads continue to receive
supply from Inverter. Alarm buzzer
beeps, UPS now on battery mode.
Utility
Rectifier and charger stop
LED off,
Abnormal/Absent,
operating Battery discharge via
(Battery Low) LED
Battery low voltage DC~DC push/pull circuit and supply to
Inverter. Alarm buzzer beeps with quick
& short succession, indicating battery
power low and Inverter may stop supply
soon.
illuminated.
Paragraph 5.2 ~ 5.7 below provide detailed descriptions of the UPS operating principle
Summary of Contents for 1000-3000VA
Page 13: ...4 3 Tower Configuration Setup Step 1 Step 2...
Page 14: ...Step 3 Step 4...
Page 15: ...4 4 Rack Mount Configuration Setup Step 3 Step 4 Step 5...
Page 16: ...Step 6 Step 7...
Page 19: ...4 5 6 Battery Replacement Step 1 Step 2 Step 3...
Page 20: ...Step 4...
Page 38: ...10 3 3 Installation Instructions Tower installation Stand alone unit Step 1 Step 2...
Page 39: ...Use with UPS Step 1 Step 2...
Page 40: ...10 3 4 Rack Mount installation Step 1 Step 2...
Page 41: ...Step 3 Step 4...
Page 42: ...Second Battery First Battery Bank UPS Connect DC Cable...
Page 44: ...Step 3 Step 4 10 3 7 Specifications...
Page 46: ...11 Technical Specifications...